QUEUING MODEL ANALYSIS FOR PRACTICAL TESTING SYSTEM OF LOGISTICS PROFESSIONAL QUALIFICATION

Abstract

The key elements for the practical testing system of logistics professional qualification are examinees, officers at goods receiving station, officers at goods aligning station and officers at goods delivery stations. The critical factor affecting numbers of examinees is the officers’ testing service capability. In fact, there is a limitation of numbers of officers and working space. The queuing model analysis in this article is used to find utilization of officers at each station, examinees waiting time for taking the test, and number of examinees who can be supported in the system. The queuing model and Arena simulation software are applied together to describe the system. The findings suggest that the first alternative is suitable for a situation which has no more than 150 examinees with the average waiting time shorter than 0.32 minute. This can balance the utilization of officers in all stations at 73%. The second alternative is for examinees numbering up to 200. The average waiting time is less than 2.08 minutes. It can balance the utilization of officers in all stations at 91%. In contrast, the third alternative is not suitable for any situation since it cannot balance the utilization at the stations. The average waiting time is more than 19.48 minutes with 33% cost increase. Moreover, numbers of examinees who are served are not bigger than 200 like the second alternative.